If strong magnetic anomalies occur near a modern iron fence, what caution is necessary?
Answer and explanation
Correct answer: Separate interference caused by modern metal
The governing principle is that magnetic surveys detect magnetic contrasts, not archaeological age. An iron fence can create a powerful modern anomaly that overwhelms, distorts, or masks weaker signals from buried remains. Investigators should map the fence, account for its distance and orientation, and separate or flag its effect before interpreting nearby readings. Option B is correct. Option A confuses a modern source with a kiln, while C and D do not solve the measurement problem.
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What is the correct answer to this question?
Separate interference caused by modern metal
Why is this the correct answer?
The governing principle is that magnetic surveys detect magnetic contrasts, not archaeological age. An iron fence can create a powerful modern anomaly that overwhelms, distorts, or masks weaker signals from buried remains. Investigators should map the fence, account for its distance and orientation, and separate or flag its effect before interpreting nearby readings. Option B is correct. Option A confuses a modern source with a kiln, while C and D do not solve the measurement problem.
Which subject and chapter does this question cover?
This is a Class 12 History question. Chapter: Bricks, Beads and Bones. Topic: excavation methods.
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